-6.41% is the change from 421 to 394
Calculation steps:
[( 394 - 421 ) ÷ 421] x 100 = -6.41%
Formula
Percentage change = [(394 - 421) / 421] x 100
Subtract the new number by the original number
394 - 421 = -27
-27 ÷ 421 = -0.06413301662707839
-0.06413301662707839 x 100 = -6.41%